Clamp



FIG. 1 is a top plan view of the clamp showing my new design;

FIG. 2 is a side elevational view thereof, the opposite side being a mirror image;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a clamp, as shown and described. 